Two circles touch each other externally. The distance between

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Two circles touch each other externally. The distance between their centres is 7 cm. If the radius of one circle is 4 cm, then the radius of the other circle will be

1. 3 cm.
2. 4 cm.
3. 5.5 cm.
4. 3.5 cm.

Correct Option: A

On the basis of question we draw a figure of two circles touch each other externally ,

We know that , Distance between two circles = OO' = r₁ + r₂ = 7 cm.
r₁ = 4 cm.
∴ r₂ = (7 – 4) cm. = 3 cm.